ioctl

Bison and Flex in C++

I now understand why the Bison C++ example uses Flex in C stdio mode:
because getting it to operate using C++ <iostream> is nigh-on
impossible. Header files are reimported a few times and you need to juggle
various #defines to produce something that'll work with a C++ stream.

You also have the problem that Flex's notion of namespaces and class
prefix names are different to what Bison expects.

Here's one I did earlier. having got this to work (kind of), my plan is
to never touch it again: